sb_tbprof.c revision a1181caac965c660be2bd350a9deb763e6f4b738
1/* 2 * This program is free software; you can redistribute it and/or 3 * modify it under the terms of the GNU General Public License 4 * as published by the Free Software Foundation; either version 2 5 * of the License, or (at your option) any later version. 6 * 7 * This program is distributed in the hope that it will be useful, 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 * GNU General Public License for more details. 11 * 12 * You should have received a copy of the GNU General Public License 13 * along with this program; if not, write to the Free Software 14 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 15 * 16 * Copyright (C) 2001, 2002, 2003 Broadcom Corporation 17 * Copyright (C) 2007 Ralf Baechle <ralf@linux-mips.org> 18 * Copyright (C) 2007 MIPS Technologies, Inc. 19 * written by Ralf Baechle <ralf@linux-mips.org> 20 */ 21 22#undef DEBUG 23 24#include <linux/device.h> 25#include <linux/module.h> 26#include <linux/kernel.h> 27#include <linux/types.h> 28#include <linux/init.h> 29#include <linux/interrupt.h> 30#include <linux/vmalloc.h> 31#include <linux/fs.h> 32#include <linux/errno.h> 33#include <linux/wait.h> 34#include <asm/io.h> 35#include <asm/sibyte/sb1250.h> 36 37#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80) 38#include <asm/sibyte/bcm1480_regs.h> 39#include <asm/sibyte/bcm1480_scd.h> 40#include <asm/sibyte/bcm1480_int.h> 41#elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X) 42#include <asm/sibyte/sb1250_regs.h> 43#include <asm/sibyte/sb1250_scd.h> 44#include <asm/sibyte/sb1250_int.h> 45#else 46#error invalid SiByte UART configuration 47#endif 48 49#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80) 50#undef K_INT_TRACE_FREEZE 51#define K_INT_TRACE_FREEZE K_BCM1480_INT_TRACE_FREEZE 52#undef K_INT_PERF_CNT 53#define K_INT_PERF_CNT K_BCM1480_INT_PERF_CNT 54#endif 55 56#include <asm/system.h> 57#include <asm/uaccess.h> 58 59#define SBPROF_TB_MAJOR 240 60 61typedef u64 tb_sample_t[6*256]; 62 63enum open_status { 64 SB_CLOSED, 65 SB_OPENING, 66 SB_OPEN 67}; 68 69struct sbprof_tb { 70 wait_queue_head_t tb_sync; 71 wait_queue_head_t tb_read; 72 struct mutex lock; 73 enum open_status open; 74 tb_sample_t *sbprof_tbbuf; 75 int next_tb_sample; 76 77 volatile int tb_enable; 78 volatile int tb_armed; 79 80}; 81 82static struct sbprof_tb sbp; 83 84#define MAX_SAMPLE_BYTES (24*1024*1024) 85#define MAX_TBSAMPLE_BYTES (12*1024*1024) 86 87#define MAX_SAMPLES (MAX_SAMPLE_BYTES/sizeof(u_int32_t)) 88#define TB_SAMPLE_SIZE (sizeof(tb_sample_t)) 89#define MAX_TB_SAMPLES (MAX_TBSAMPLE_BYTES/TB_SAMPLE_SIZE) 90 91/* ioctls */ 92#define SBPROF_ZBSTART _IOW('s', 0, int) 93#define SBPROF_ZBSTOP _IOW('s', 1, int) 94#define SBPROF_ZBWAITFULL _IOW('s', 2, int) 95 96/* 97 * Routines for using 40-bit SCD cycle counter 98 * 99 * Client responsible for either handling interrupts or making sure 100 * the cycles counter never saturates, e.g., by doing 101 * zclk_timer_init(0) at least every 2^40 - 1 ZCLKs. 102 */ 103 104/* 105 * Configures SCD counter 0 to count ZCLKs starting from val; 106 * Configures SCD counters1,2,3 to count nothing. 107 * Must not be called while gathering ZBbus profiles. 108 */ 109 110#define zclk_timer_init(val) \ 111 __asm__ __volatile__ (".set push;" \ 112 ".set mips64;" \ 113 "la $8, 0xb00204c0;" /* SCD perf_cnt_cfg */ \ 114 "sd %0, 0x10($8);" /* write val to counter0 */ \ 115 "sd %1, 0($8);" /* config counter0 for zclks*/ \ 116 ".set pop" \ 117 : /* no outputs */ \ 118 /* enable, counter0 */ \ 119 : /* inputs */ "r"(val), "r" ((1ULL << 33) | 1ULL) \ 120 : /* modifies */ "$8" ) 121 122 123/* Reads SCD counter 0 and puts result in value 124 unsigned long long val; */ 125#define zclk_get(val) \ 126 __asm__ __volatile__ (".set push;" \ 127 ".set mips64;" \ 128 "la $8, 0xb00204c0;" /* SCD perf_cnt_cfg */ \ 129 "ld %0, 0x10($8);" /* write val to counter0 */ \ 130 ".set pop" \ 131 : /* outputs */ "=r"(val) \ 132 : /* inputs */ \ 133 : /* modifies */ "$8" ) 134 135#define DEVNAME "sb_tbprof" 136 137#define TB_FULL (sbp.next_tb_sample == MAX_TB_SAMPLES) 138 139/* 140 * Support for ZBbus sampling using the trace buffer 141 * 142 * We use the SCD performance counter interrupt, caused by a Zclk counter 143 * overflow, to trigger the start of tracing. 144 * 145 * We set the trace buffer to sample everything and freeze on 146 * overflow. 147 * 148 * We map the interrupt for trace_buffer_freeze to handle it on CPU 0. 149 * 150 */ 151 152static u64 tb_period; 153 154static void arm_tb(void) 155{ 156 u64 scdperfcnt; 157 u64 next = (1ULL << 40) - tb_period; 158 u64 tb_options = M_SCD_TRACE_CFG_FREEZE_FULL; 159 160 /* 161 * Generate an SCD_PERFCNT interrupt in TB_PERIOD Zclks to 162 * trigger start of trace. XXX vary sampling period 163 */ 164 __raw_writeq(0, IOADDR(A_SCD_PERF_CNT_1)); 165 scdperfcnt = __raw_readq(IOADDR(A_SCD_PERF_CNT_CFG)); 166 167 /* 168 * Unfortunately, in Pass 2 we must clear all counters to knock down 169 * a previous interrupt request. This means that bus profiling 170 * requires ALL of the SCD perf counters. 171 */ 172#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80) 173 __raw_writeq((scdperfcnt & ~M_SPC_CFG_SRC1) | 174 /* keep counters 0,2,3,4,5,6,7 as is */ 175 V_SPC_CFG_SRC1(1), /* counter 1 counts cycles */ 176 IOADDR(A_BCM1480_SCD_PERF_CNT_CFG0)); 177 __raw_writeq( 178 M_SPC_CFG_ENABLE | /* enable counting */ 179 M_SPC_CFG_CLEAR | /* clear all counters */ 180 V_SPC_CFG_SRC1(1), /* counter 1 counts cycles */ 181 IOADDR(A_BCM1480_SCD_PERF_CNT_CFG1)); 182#else 183 __raw_writeq((scdperfcnt & ~M_SPC_CFG_SRC1) | 184 /* keep counters 0,2,3 as is */ 185 M_SPC_CFG_ENABLE | /* enable counting */ 186 M_SPC_CFG_CLEAR | /* clear all counters */ 187 V_SPC_CFG_SRC1(1), /* counter 1 counts cycles */ 188 IOADDR(A_SCD_PERF_CNT_CFG)); 189#endif 190 __raw_writeq(next, IOADDR(A_SCD_PERF_CNT_1)); 191 /* Reset the trace buffer */ 192 __raw_writeq(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG)); 193#if 0 && defined(M_SCD_TRACE_CFG_FORCECNT) 194 /* XXXKW may want to expose control to the data-collector */ 195 tb_options |= M_SCD_TRACE_CFG_FORCECNT; 196#endif 197 __raw_writeq(tb_options, IOADDR(A_SCD_TRACE_CFG)); 198 sbp.tb_armed = 1; 199} 200 201static irqreturn_t sbprof_tb_intr(int irq, void *dev_id) 202{ 203 int i; 204 205 pr_debug(DEVNAME ": tb_intr\n"); 206 207 if (sbp.next_tb_sample < MAX_TB_SAMPLES) { 208 /* XXX should use XKPHYS to make writes bypass L2 */ 209 u64 *p = sbp.sbprof_tbbuf[sbp.next_tb_sample++]; 210 /* Read out trace */ 211 __raw_writeq(M_SCD_TRACE_CFG_START_READ, 212 IOADDR(A_SCD_TRACE_CFG)); 213 __asm__ __volatile__ ("sync" : : : "memory"); 214 /* Loop runs backwards because bundles are read out in reverse order */ 215 for (i = 256 * 6; i > 0; i -= 6) { 216 /* Subscripts decrease to put bundle in the order */ 217 /* t0 lo, t0 hi, t1 lo, t1 hi, t2 lo, t2 hi */ 218 p[i - 1] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); 219 /* read t2 hi */ 220 p[i - 2] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); 221 /* read t2 lo */ 222 p[i - 3] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); 223 /* read t1 hi */ 224 p[i - 4] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); 225 /* read t1 lo */ 226 p[i - 5] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); 227 /* read t0 hi */ 228 p[i - 6] = __raw_readq(IOADDR(A_SCD_TRACE_READ)); 229 /* read t0 lo */ 230 } 231 if (!sbp.tb_enable) { 232 pr_debug(DEVNAME ": tb_intr shutdown\n"); 233 __raw_writeq(M_SCD_TRACE_CFG_RESET, 234 IOADDR(A_SCD_TRACE_CFG)); 235 sbp.tb_armed = 0; 236 wake_up_interruptible(&sbp.tb_sync); 237 } else { 238 /* knock down current interrupt and get another one later */ 239 arm_tb(); 240 } 241 } else { 242 /* No more trace buffer samples */ 243 pr_debug(DEVNAME ": tb_intr full\n"); 244 __raw_writeq(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG)); 245 sbp.tb_armed = 0; 246 if (!sbp.tb_enable) 247 wake_up_interruptible(&sbp.tb_sync); 248 wake_up_interruptible(&sbp.tb_read); 249 } 250 return IRQ_HANDLED; 251} 252 253static irqreturn_t sbprof_pc_intr(int irq, void *dev_id) 254{ 255 printk(DEVNAME ": unexpected pc_intr"); 256 return IRQ_NONE; 257} 258 259/* 260 * Requires: Already called zclk_timer_init with a value that won't 261 * saturate 40 bits. No subsequent use of SCD performance counters 262 * or trace buffer. 263 */ 264 265static int sbprof_zbprof_start(struct file *filp) 266{ 267 u64 scdperfcnt; 268 int err; 269 270 if (xchg(&sbp.tb_enable, 1)) 271 return -EBUSY; 272 273 pr_debug(DEVNAME ": starting\n"); 274 275 sbp.next_tb_sample = 0; 276 filp->f_pos = 0; 277 278 err = request_irq(K_INT_TRACE_FREEZE, sbprof_tb_intr, 0, 279 DEVNAME " trace freeze", &sbp); 280 if (err) 281 return -EBUSY; 282 283 /* Make sure there isn't a perf-cnt interrupt waiting */ 284 scdperfcnt = __raw_readq(IOADDR(A_SCD_PERF_CNT_CFG)); 285 /* Disable and clear counters, override SRC_1 */ 286 __raw_writeq((scdperfcnt & ~(M_SPC_CFG_SRC1 | M_SPC_CFG_ENABLE)) | 287 M_SPC_CFG_ENABLE | M_SPC_CFG_CLEAR | V_SPC_CFG_SRC1(1), 288 IOADDR(A_SCD_PERF_CNT_CFG)); 289 290 /* 291 * We grab this interrupt to prevent others from trying to use 292 * it, even though we don't want to service the interrupts 293 * (they only feed into the trace-on-interrupt mechanism) 294 */ 295 if (request_irq(K_INT_PERF_CNT, sbprof_pc_intr, 0, DEVNAME " scd perfcnt", &sbp)) { 296 free_irq(K_INT_TRACE_FREEZE, &sbp); 297 return -EBUSY; 298 } 299 300 /* 301 * I need the core to mask these, but the interrupt mapper to 302 * pass them through. I am exploiting my knowledge that 303 * cp0_status masks out IP[5]. krw 304 */ 305#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80) 306 __raw_writeq(K_BCM1480_INT_MAP_I3, 307 IOADDR(A_BCM1480_IMR_REGISTER(0, R_BCM1480_IMR_INTERRUPT_MAP_BASE_L) + 308 ((K_BCM1480_INT_PERF_CNT & 0x3f) << 3))); 309#else 310 __raw_writeq(K_INT_MAP_I3, 311 IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) + 312 (K_INT_PERF_CNT << 3))); 313#endif 314 315 /* Initialize address traps */ 316 __raw_writeq(0, IOADDR(A_ADDR_TRAP_UP_0)); 317 __raw_writeq(0, IOADDR(A_ADDR_TRAP_UP_1)); 318 __raw_writeq(0, IOADDR(A_ADDR_TRAP_UP_2)); 319 __raw_writeq(0, IOADDR(A_ADDR_TRAP_UP_3)); 320 321 __raw_writeq(0, IOADDR(A_ADDR_TRAP_DOWN_0)); 322 __raw_writeq(0, IOADDR(A_ADDR_TRAP_DOWN_1)); 323 __raw_writeq(0, IOADDR(A_ADDR_TRAP_DOWN_2)); 324 __raw_writeq(0, IOADDR(A_ADDR_TRAP_DOWN_3)); 325 326 __raw_writeq(0, IOADDR(A_ADDR_TRAP_CFG_0)); 327 __raw_writeq(0, IOADDR(A_ADDR_TRAP_CFG_1)); 328 __raw_writeq(0, IOADDR(A_ADDR_TRAP_CFG_2)); 329 __raw_writeq(0, IOADDR(A_ADDR_TRAP_CFG_3)); 330 331 /* Initialize Trace Event 0-7 */ 332 /* when interrupt */ 333 __raw_writeq(M_SCD_TREVT_INTERRUPT, IOADDR(A_SCD_TRACE_EVENT_0)); 334 __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_1)); 335 __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_2)); 336 __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_3)); 337 __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_4)); 338 __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_5)); 339 __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_6)); 340 __raw_writeq(0, IOADDR(A_SCD_TRACE_EVENT_7)); 341 342 /* Initialize Trace Sequence 0-7 */ 343 /* Start on event 0 (interrupt) */ 344 __raw_writeq(V_SCD_TRSEQ_FUNC_START | 0x0fff, 345 IOADDR(A_SCD_TRACE_SEQUENCE_0)); 346 /* dsamp when d used | asamp when a used */ 347 __raw_writeq(M_SCD_TRSEQ_ASAMPLE | M_SCD_TRSEQ_DSAMPLE | 348 K_SCD_TRSEQ_TRIGGER_ALL, 349 IOADDR(A_SCD_TRACE_SEQUENCE_1)); 350 __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_2)); 351 __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_3)); 352 __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_4)); 353 __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_5)); 354 __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_6)); 355 __raw_writeq(0, IOADDR(A_SCD_TRACE_SEQUENCE_7)); 356 357 /* Now indicate the PERF_CNT interrupt as a trace-relevant interrupt */ 358#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80) 359 __raw_writeq(1ULL << (K_BCM1480_INT_PERF_CNT & 0x3f), 360 IOADDR(A_BCM1480_IMR_REGISTER(0, R_BCM1480_IMR_INTERRUPT_TRACE_L))); 361#else 362 __raw_writeq(1ULL << K_INT_PERF_CNT, 363 IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_TRACE))); 364#endif 365 arm_tb(); 366 367 pr_debug(DEVNAME ": done starting\n"); 368 369 return 0; 370} 371 372static int sbprof_zbprof_stop(void) 373{ 374 int err = 0; 375 376 pr_debug(DEVNAME ": stopping\n"); 377 378 if (sbp.tb_enable) { 379 /* 380 * XXXKW there is a window here where the intr handler may run, 381 * see the disable, and do the wake_up before this sleep 382 * happens. 383 */ 384 pr_debug(DEVNAME ": wait for disarm\n"); 385 err = wait_event_interruptible(sbp.tb_sync, !sbp.tb_armed); 386 pr_debug(DEVNAME ": disarm complete, stat %d\n", err); 387 388 if (err) 389 return err; 390 391 sbp.tb_enable = 0; 392 free_irq(K_INT_TRACE_FREEZE, &sbp); 393 free_irq(K_INT_PERF_CNT, &sbp); 394 } 395 396 pr_debug(DEVNAME ": done stopping\n"); 397 398 return err; 399} 400 401static int sbprof_tb_open(struct inode *inode, struct file *filp) 402{ 403 int minor; 404 405 minor = iminor(inode); 406 if (minor != 0) 407 return -ENODEV; 408 409 if (xchg(&sbp.open, SB_OPENING) != SB_CLOSED) 410 return -EBUSY; 411 412 memset(&sbp, 0, sizeof(struct sbprof_tb)); 413 sbp.sbprof_tbbuf = vzalloc(MAX_TBSAMPLE_BYTES); 414 if (!sbp.sbprof_tbbuf) { 415 sbp.open = SB_CLOSED; 416 wmb(); 417 return -ENOMEM; 418 } 419 420 init_waitqueue_head(&sbp.tb_sync); 421 init_waitqueue_head(&sbp.tb_read); 422 mutex_init(&sbp.lock); 423 424 sbp.open = SB_OPEN; 425 wmb(); 426 427 return 0; 428} 429 430static int sbprof_tb_release(struct inode *inode, struct file *filp) 431{ 432 int minor; 433 434 minor = iminor(inode); 435 if (minor != 0 || sbp.open != SB_CLOSED) 436 return -ENODEV; 437 438 mutex_lock(&sbp.lock); 439 440 if (sbp.tb_armed || sbp.tb_enable) 441 sbprof_zbprof_stop(); 442 443 vfree(sbp.sbprof_tbbuf); 444 sbp.open = SB_CLOSED; 445 wmb(); 446 447 mutex_unlock(&sbp.lock); 448 449 return 0; 450} 451 452static ssize_t sbprof_tb_read(struct file *filp, char *buf, 453 size_t size, loff_t *offp) 454{ 455 int cur_sample, sample_off, cur_count, sample_left; 456 char *src; 457 int count = 0; 458 char *dest = buf; 459 long cur_off = *offp; 460 461 if (!access_ok(VERIFY_WRITE, buf, size)) 462 return -EFAULT; 463 464 mutex_lock(&sbp.lock); 465 466 count = 0; 467 cur_sample = cur_off / TB_SAMPLE_SIZE; 468 sample_off = cur_off % TB_SAMPLE_SIZE; 469 sample_left = TB_SAMPLE_SIZE - sample_off; 470 471 while (size && (cur_sample < sbp.next_tb_sample)) { 472 int err; 473 474 cur_count = size < sample_left ? size : sample_left; 475 src = (char *)(((long)sbp.sbprof_tbbuf[cur_sample])+sample_off); 476 err = __copy_to_user(dest, src, cur_count); 477 if (err) { 478 *offp = cur_off + cur_count - err; 479 mutex_unlock(&sbp.lock); 480 return err; 481 } 482 pr_debug(DEVNAME ": read from sample %d, %d bytes\n", 483 cur_sample, cur_count); 484 size -= cur_count; 485 sample_left -= cur_count; 486 if (!sample_left) { 487 cur_sample++; 488 sample_off = 0; 489 sample_left = TB_SAMPLE_SIZE; 490 } else { 491 sample_off += cur_count; 492 } 493 cur_off += cur_count; 494 dest += cur_count; 495 count += cur_count; 496 } 497 *offp = cur_off; 498 mutex_unlock(&sbp.lock); 499 500 return count; 501} 502 503static long sbprof_tb_ioctl(struct file *filp, 504 unsigned int command, 505 unsigned long arg) 506{ 507 int err = 0; 508 509 switch (command) { 510 case SBPROF_ZBSTART: 511 mutex_lock(&sbp.lock); 512 err = sbprof_zbprof_start(filp); 513 mutex_unlock(&sbp.lock); 514 break; 515 516 case SBPROF_ZBSTOP: 517 mutex_lock(&sbp.lock); 518 err = sbprof_zbprof_stop(); 519 mutex_unlock(&sbp.lock); 520 break; 521 522 case SBPROF_ZBWAITFULL: { 523 err = wait_event_interruptible(sbp.tb_read, TB_FULL); 524 if (err) 525 break; 526 527 err = put_user(TB_FULL, (int *) arg); 528 break; 529 } 530 531 default: 532 err = -EINVAL; 533 break; 534 } 535 536 return err; 537} 538 539static const struct file_operations sbprof_tb_fops = { 540 .owner = THIS_MODULE, 541 .open = sbprof_tb_open, 542 .release = sbprof_tb_release, 543 .read = sbprof_tb_read, 544 .unlocked_ioctl = sbprof_tb_ioctl, 545 .compat_ioctl = sbprof_tb_ioctl, 546 .mmap = NULL, 547 .llseek = default_llseek, 548}; 549 550static struct class *tb_class; 551static struct device *tb_dev; 552 553static int __init sbprof_tb_init(void) 554{ 555 struct device *dev; 556 struct class *tbc; 557 int err; 558 559 if (register_chrdev(SBPROF_TB_MAJOR, DEVNAME, &sbprof_tb_fops)) { 560 printk(KERN_WARNING DEVNAME ": initialization failed (dev %d)\n", 561 SBPROF_TB_MAJOR); 562 return -EIO; 563 } 564 565 tbc = class_create(THIS_MODULE, "sb_tracebuffer"); 566 if (IS_ERR(tbc)) { 567 err = PTR_ERR(tbc); 568 goto out_chrdev; 569 } 570 571 tb_class = tbc; 572 573 dev = device_create(tbc, NULL, MKDEV(SBPROF_TB_MAJOR, 0), NULL, "tb"); 574 if (IS_ERR(dev)) { 575 err = PTR_ERR(dev); 576 goto out_class; 577 } 578 tb_dev = dev; 579 580 sbp.open = SB_CLOSED; 581 wmb(); 582 tb_period = zbbus_mhz * 10000LL; 583 pr_info(DEVNAME ": initialized - tb_period = %lld\n", 584 (long long) tb_period); 585 return 0; 586 587out_class: 588 class_destroy(tb_class); 589out_chrdev: 590 unregister_chrdev(SBPROF_TB_MAJOR, DEVNAME); 591 592 return err; 593} 594 595static void __exit sbprof_tb_cleanup(void) 596{ 597 device_destroy(tb_class, MKDEV(SBPROF_TB_MAJOR, 0)); 598 unregister_chrdev(SBPROF_TB_MAJOR, DEVNAME); 599 class_destroy(tb_class); 600} 601 602module_init(sbprof_tb_init); 603module_exit(sbprof_tb_cleanup); 604 605MODULE_ALIAS_CHARDEV_MAJOR(SBPROF_TB_MAJOR); 606MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>"); 607MODULE_LICENSE("GPL"); 608